Electromagnetic radiation in the terahertz (THz) frequency range is a fascinating
spectroscopic tool that provides resonant access to fundamental modes, including the …

This work reviews the experimental studies on photo-induced cooperative phenomena
(photo-induced phase transitions, PIPT), which are related to ultrafast structural and …

Electron–electron interactions can render an otherwise conducting material insulating, with
the insulator–metal phase transition in correlated-electron materials being the canonical …

Over the past decade, breakthroughs in the generation and control of ultrafast high-field
terahertz (THz) radiation have led to new spectroscopic methodologies for the study of light …

We demonstrate nonlinear metamaterial split ring resonators (SRRs) on GaAs at terahertz
frequencies. For SRRs on doped GaAs films, incident terahertz radiation with peak fields …

Understanding light interaction with metallic structures provides opportunities of
manipulation of light, and is at the core of various research areas including terahertz (THz) …

We investigate the nonlinear response of terahertz (THz) metamaterial perfect absorbers
consisting of electric split ring resonators on GaAs integrated with a polyimide spacer and …

The fields of biosensing, nanospectroscopy, and plasmonics have great potential for near-
field terahertz (THz) technology. In this work, we demonstrate that electro-optic (EO) imaging …

Strong coupling between light and matter occurs when the two interact such that new hybrid
modes, the so-called polaritons, are formed. Here, we report on the strong coupling of both …

We report on the observation of ultrafast impact ionization and carrier generation in high
resistivity silicon induced by intense subpicosecond terahertz transients. Local terahertz …